Confidential Display System Using Phase-Synchronized Glasses
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Solution Overview
Problem
Current methods for confidential displays, such as switchable viewing angle and liquid crystal glasses, suffer from narrow observing ranges and image flickering due to consecutive frames of antiphase or inphase signals, which degrade the display effect and confidentiality.
Innovation Solution
A display system comprising a display screen and glasses that use predetermined playing codes to control the display of normal and interference images, with the glasses switching between light transmitting and shielding states based on logic values, ensuring the user with matching glasses sees normal images while others see flickering images, without lowering the video signal frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal glasses are used with 50% probability antiphase and inphase signals, then confidential display is achieved, but image flickering occurs due to consecutive frames of same phase signals
Solution Approach 1:
The patent applies periodic action by organizing frames into groups with predetermined phase patterns (00, 01, 10, 11) that systematically alternate between antiphase and inphase signals. This periodic structure ensures that consecutive frames of the same phase do not occur, eliminating image flickering while maintaining confidentiality through the predictable phase alternation pattern that synchronized glasses can decode.
Solution Approach 2:
The patent implements preliminary action by pre-defining the phase patterns for each frame group before display. The four-pole double-throw electronic switch is controlled in advance with predetermined sequences of antiphase and inphase signals, allowing the liquid crystal glasses to be switched on or off in advance for each frame group, thereby avoiding flickering caused by random or consecutive same-phase frames.
2Reliability
If switchable viewing angle mode is used for confidential display, then observing range is limited to certain angle, but this achieves confidentiality
Solution Approach 1:
The patent uses liquid crystal glasses as an intermediary device between the display screen and the viewer. These glasses act as a mediator that can be switched on or off to block or transmit light, allowing the confidential display to be viewed clearly by authorized users wearing the glasses from any angle, while unauthorized viewers see only blank or inverted images, thus achieving both wide observing range and confidentiality.
3Device complexity
If consecutive frames of antiphase or inphase signals are sent, then liquid crystal glasses switching is simplified, but video signal frequency decreases and image flickering occurs
Solution Approach 1:
The patent applies periodic action by organizing frames into groups with predetermined phase patterns (00, 01, 10, 11) that systematically alternate between antiphase and inphase signals. This periodic structure ensures that consecutive frames of the same phase do not occur, eliminating image flickering while maintaining confidentiality through the predictable phase alternation pattern that synchronized glasses can decode.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves confidential display with a wide observing range and high confidentiality by synchronizing the display and glasses, reducing the number of consecutive frames and simplifying control, thus enhancing the display effect and preventing image flickering.
Implementation Method 1
a pair of liquid crystal glasses including a first substrate, a second substrate and a liquid crystal layer between the first and the second substrates
Implementation Method 2
a four-pole double-throw electronic switch is controlled to send antiphase signals and inphase signals to the screen in a time-division manner. The liquid crystal glasses are connected to the electronic switch, and are switched on when the inphase signals are sent to the screen and switched off when the antiphase signals are sent to the screen
Data Source
AI summary
A display screen, a pair of glasses, a display system and a playing method are provided. The display screen includes a display control module and a display panel. The display control module controls the display panel to display multiple frames of images according to multiple predetermined playing codes. Each playing code corresponds to one frame of image. Each frame of image is displayed as normal image or interference image based on different logic values of the corresponding playing code. The multiple frames of images are divided into multiple consecutive frame groups. The quantity of consecutive frames corresponding to playing codes having an identical logic value in each frame group is not larger than a predetermined value, such that a user wearing glasses matching the display screen can see the normal images displayed on the display panel and cannot see the interference images displayed on the display panel.